Slip this slim-fitting jacket over your tank or underneath your outerwear when you need a sweat-wicking cool-down layer while on the go. The ribbed panelling on the sides and under the arms is stretchy for mobility and shape retention. Made with Swift Ultra fabric that is lightweight, four-way stretch, and sweat-wicking. swift ultra light Four-way stretch Swift Ultra Light fabric is an airy, lightweight fabric woven to wick sweat and provide airflow—seriously, it’s like being in the buff four-way stretch lightweight sweat-wicking woven for airflow features Designed for: Office Travel Commute Headphone-friendly: Cord exit helps headphones stay in place Fit : Body Skimming, hip length Technical fabric liner: Seriously Light™ Luon fabric liner is sweat-wicking and lightweight Secure storage: Secure front pockets to store your essentials